Intrasubject direct replication
An experimental replication of a previous study in which the researcher exactly duplicates a previous study using the same subjects as the original study.
Task List Reference: D-2
Distinguish between internal and external validity.
Intersubject direct replication
An experimental replication of a previous study in which the researcher exactly duplicates a previous study but uses different subjects from the original study.
Systematic replication
An experimental replication of a previous study in which the researcher intentionally changes one or more features of a prior experiment.